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Radar Altimeter REAPER Geophysical Data Record - GDR
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Last update: 10 September 2014
This is a RA Geophysical Data Record (GDR) product containing radar range, orbital altitude, wind speed, wave height and water vapour from the ATSR/MWR as well as geophysical corrections.
The REAPER (REprocessing of Altimeter Products for ERS) product is generated by applying a similar processing as for Envisat RA-2 on the Level 1b consolidated waveforms using 4 different re-trackers, RA calibration improvement, new precise orbit solution (POD), new ionospheric corrections (NICO09 until 1998 and GIM up to 2003), ECMWF ERA-interim model and updated SSB tables.
This product contains two data rates: a low rate of 1Hz and a high rate of 20Hz.
Most 1Hz data is also represented at 20Hz, while microwave radiometer (ATSR/MWR) data and the atmospheric and geophysical corrections are only given at 1 Hz.
The REAPER GDR (ERS_ALT_2_) is a global product including data over ocean, ice and land.
It should be noted that this product differs from the Envisat RA2 in the following ways:
Data Set Specifications
How to access this data
Terms & Conditions applicable
Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions
REAPER Data Product Handbook
REAPER Calibration Monitoring
Cal/Val evaluation of REAPER ERS altimeter data
RA L2 Validation Report
REAPER Data Performance Monitoring and QA
More RA Documents
How to access EO data
From Delivery to Acquisition
ESA Earth Observation Campaigns Data
ESA has been involved in many Earth Observation campaigns over the past 25 years, from ground-based surveys, to ships at sea, aircraft and balloons in the atmosphere and the orbiting satellites in space.
To learn more about these campaigns and available datasets from them, please see the Campaigns page.